JP2698522B2 - Hot rolling method for steel - Google Patents
Hot rolling method for steelInfo
- Publication number
- JP2698522B2 JP2698522B2 JP34457192A JP34457192A JP2698522B2 JP 2698522 B2 JP2698522 B2 JP 2698522B2 JP 34457192 A JP34457192 A JP 34457192A JP 34457192 A JP34457192 A JP 34457192A JP 2698522 B2 JP2698522 B2 JP 2698522B2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- steel material
- water
- rolling
- hot rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Metal Rolling (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、鋼材の熱間圧延、と
くにステンレス鋼材 (フェライ系、マルテンサイト系)
の熱間圧延において問題となるロールの焼付きに起因し
た表面欠陥の発生を製造コストの上昇を招くことなしに
軽減しようとするものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to hot rolling of steel materials, especially stainless steel materials (ferritic, martensitic).
The purpose of the present invention is to reduce the occurrence of surface defects due to the seizure of rolls, which is a problem in hot rolling, without increasing production costs.
【０００２】[0002]
【従来の技術】ステンレス鋼、とくにフェライト系ステ
ンレス鋼の熱間仕上げ圧延においては圧延ロールの焼付
きが発生しやすく、これが製品の表面品質を劣化させる
原因になっていた。この対策としては圧延すべき鋼材の
表面において酸化スケールを積極的に生成させるか、ま
たそのスケールの厚さを増加させることが有効であっ
て、この点に関しては、素材 (マルテンサイト系ステン
レス鋼) の表面に２次スケールを生成させてから仕上げ
圧延を行う特公昭60-50522号公報に開示のような技術
や、圧延パス間で空気、酸素ガス等の少なくとも１種を
鋼材 (フェライト系ステンレス鋼) 表面に吹付け酸化ス
ケールを生成させてから圧延を行う特公平４-42082号公
報に開示のような技術が参照される。2. Description of the Related Art In hot finishing rolling of stainless steel, particularly ferritic stainless steel, seizure of a rolling roll is apt to occur, and this has caused deterioration of the surface quality of a product. As a countermeasure, it is effective to actively generate oxide scale on the surface of the steel material to be rolled or to increase the thickness of the scale. In this regard, the material (martensitic stainless steel) A technique disclosed in Japanese Patent Publication No. Sho 60-50522, in which a secondary scale is formed on the surface of the steel and then finish rolling is performed, or at least one of air, oxygen gas, and the like is used between rolling passes using a steel material (ferritic stainless steel). ) Reference is made to a technique disclosed in Japanese Patent Publication No. 4-42082 in which rolling is performed after sprayed oxide scale is formed on the surface.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上記従来の
技術におけるスケール生成手段は、酸素ガスや水蒸気
等、コストの高いものを用いるものであるから、製造コ
ストの上昇が避けられない不利があった。また、このよ
うなスケール生成処理は、鋼材の搬送を一たん停止した
状態もしくは搬送速度を低下させた状態で行うので、生
産性の低下を伴うものであった。この発明の目的は、ス
テンレス鋼の熱間圧延において問題となっていた表面品
質の劣化を製造コストの上昇を招くことなしに軽減でき
る新規な方法を提案するところにある。However, since the scale generating means in the above-mentioned conventional technique uses expensive gas such as oxygen gas or water vapor, there is a disadvantage that the production cost is inevitably increased. . In addition, since such a scale generation process is performed in a state where the transfer of the steel material is temporarily stopped or in a state where the transfer speed is reduced, the productivity is reduced. An object of the present invention is to propose a new method capable of reducing the deterioration of surface quality, which has been a problem in hot rolling of stainless steel, without increasing the production cost.
【０００４】[0004]
【課題を解決するための手段】鋼材を水冷すればその表
層は水蒸気膜に覆われることはよく知られているとおり
であり、したがってこのような手段を用いれば鋼材表面
における酸化速度を上昇させることができ、この処理に
かかる余分な時間を省略化することができる。しかしな
がら、水冷による鋼材の温度降下は熱間圧延を行う場合
かえって障害になる。この発明は圧延すべき鋼材の温度
降下を抑制しかつ鋼材の表層に必要充分な水蒸気を供給
して酸化被膜の生成を促進すべく、熱間圧延を行う領域
の相互間 (圧延と圧延とのパスインターバルの間) に鋼
材の表面に対して霧状の水を噴射するようにしたもので
ある。It is well known that if a steel material is cooled with water, its surface layer is covered with a water vapor film. Therefore, using such a means can increase the oxidation rate on the surface of the steel material. And the extra time required for this processing can be omitted. However, the temperature drop of the steel material due to water cooling is an obstacle rather than performing hot rolling. The present invention suppresses the temperature drop of the steel material to be rolled and supplies necessary and sufficient steam to the surface layer of the steel material to promote the formation of an oxide film. During the pass interval), mist-like water is sprayed on the surface of the steel material.
【０００５】[0005]
【作用】鋼材の表面に到達した霧状の水は直ちに水蒸気
となってその表面を覆うことになる。その結果、鋼材の
表層における酸化が促進される。この発明において噴射
する水は鋼材の表面を覆うような酸化被膜が形成される
に充分な水蒸気を発生させることができればよいもので
あるからその量は微量ですみ、鋼材における冷却効果も
極めて小さい。また水蒸気等の噴霧に比べてスケールの
生成速度が大きいため搬送速度を低下させる必要はな
く、生産性を向上させることができる。The mist of water that has reached the surface of the steel material immediately becomes steam and covers the surface. As a result, oxidation in the surface layer of the steel material is promoted. In the present invention, the water to be sprayed is only required to be able to generate sufficient water vapor to form an oxide film covering the surface of the steel material. Therefore, the amount of water is small and the cooling effect on the steel material is extremely small. In addition, since the scale generation speed is higher than the spraying of steam or the like, there is no need to reduce the transport speed, and the productivity can be improved.
【０００６】霧状の水を噴射するに当たっては、噴射角
が120 °程度になるフルコーンノズルを鋼材の上下でそ
の幅方向に３個程度, 長手方向に５ｍピッチで配置し、
噴射圧力３kgf/mm2 で６ l／min の条件下で噴射するよ
うにし、噴射によって発生した水蒸気を逃がさないよう
にその周りをケーシングで覆うようにするのが好まし
い。上記の噴射条件は３l/min/m2の水量密度に相当し水
冷の場合は普通数100l/min/m2 〜数千l/min/m2の領域で
行われることを考慮するとはるかに少ない領域であり、
この発明はこのような設備内を板速100 〜300 mpm で通
過させることで酸化被膜を成長させるものである。In spraying water in the form of mist, three full-cone nozzles having an injection angle of about 120 ° are arranged above and below the steel material in the width direction and at a pitch of 5 m in the longitudinal direction.
It is preferable to inject at a spray pressure of 3 kgf / mm 2 at a rate of 6 l / min, and to cover the surroundings with a casing so as to prevent the steam generated by the injection from leaking. The above injection conditions much less considering that takes place in the region of 3l / min / m corresponds to 2 of water density Average number in the case of water cooling 100l / min / m 2 ~ number thousand l / min / m 2 Area,
According to the present invention, an oxide film is grown by passing through such equipment at a plate speed of 100 to 300 mpm.
【０００７】図１はこの発明を実施するのに用いて好適
な設備を模式的に示したものであって、図中１は鋼材の
先端および後端の不良部分を取り除くクロップシャー、
２は熱間仕上げ圧延機群、３はクロップシャー１と熱間
仕上げ圧延機群２との間に配置した例で示したミストス
プレーベッダーであって、このヘッダー３は鋼板Ｓの表
面に噴霧状の水を噴射してその周りを水蒸気雰囲気とし
て酸化被膜の生成を促進させる。FIG. 1 schematically shows equipment suitable for use in carrying out the present invention. In FIG. 1, reference numeral 1 denotes a crop shear for removing defective portions at the front and rear ends of a steel material.
Reference numeral 2 denotes a hot finish rolling mill group, and reference numeral 3 denotes a mist spray bedder shown as an example disposed between the crop shear 1 and the hot finishing rolling mill group 2. The header 3 is sprayed on the surface of the steel sheet S. Is sprayed to form a steam atmosphere around it, thereby promoting the formation of an oxide film.
【０００８】上掲図１に示すような設備を適用するに当
たっては、粗圧延を終えた鋼板Ｓの先端および後端の不
良部分をクロップシャー１で切断したのち、ミストスプ
レーヘッダー３にて鋼板Ｓの表面に霧状の水を噴射しな
がら搬送し、続いて仕上げ圧延機群２に通して所定の寸
法に仕上げる。In applying the equipment as shown in FIG. 1 above, the defective portions at the front and rear ends of the steel sheet S after the rough rolling are cut with a crop shear 1, and then the steel sheet S is mist-sprayed. Is transported while spraying water in the form of mist on the surface thereof, and then is passed through a finishing mill group 2 to finish it to predetermined dimensions.
【０００９】図１では、クロップシャー１の出側から仕
上げ圧延機群２に至るまでの領域にミストスプレーヘッ
ダー３を配置した例を示したが、この発明は、パスイン
ターバルの間に霧状の水を噴射すればよいものであるか
ら、図２に示すように、粗圧延機４の出側からクロップ
シャー１に至るまでの領域に適用するようにしてもよい
し、また、圧延中における酸化被膜の剥離を補償すべく
仕上げ圧延機の相互間に、あるいは粗圧延機において適
用するようにしてもよい。ミストスプレーヘッダー３に
よる水の噴射によって発生した水蒸気を効率よく使用す
るため図２に示すように該ヘッダー３を取り囲むように
ボックス５を設けるのが有利である。FIG. 1 shows an example in which the mist spray header 3 is arranged in a region from the output side of the crop shear 1 to the finishing mill group 2, but the present invention provides a mist spray header during a pass interval. Since water only needs to be injected, as shown in FIG. 2, it may be applied to a region from the exit side of the rough rolling mill 4 to the crop shear 1, or may be oxidized during rolling. It may be applied between finish rolling mills or in a rough rolling mill to compensate for the peeling of the coating. It is advantageous to provide a box 5 surrounding the header 3 as shown in FIG.
【００１０】[0010]
【実施例】幅1200mm, 厚さ200mm になるフェライト系ス
テンレス鋼スラブを粗圧延して幅1200mm, 厚さ25mmとし
たのち、粗最終段より、クロップシャー、スケールブレ
ーカ等の構造物のない領域で霧状の水を噴射（噴射条
件：噴射面1200°のフルコーンノズルを板幅方向に３
個、長手方向に５m ピッチで配置し噴射圧力：３kgf/mm
2 、流量６l/min)しながら仕上げ圧延機群へ搬送し幅12
00mm, 厚さ３mmになるストリップに仕上げ、得られたス
トリップの表面品質について調査した。その結果、ロー
ルの焼きつきによる表面欠陥の発生率は従来の1/4 に軽
減され、また、これによる温度降下は５℃であり、搬送
速度の低下も必要なく圧延可能であった。[Example] A ferrite-based alloy with a width of 1200 mm and a thickness of 200 mm
The stainless steel slab is roughly rolled to a width of 1200 mm and a thickness of 25 mm.
After that, crop shear and scale blur from the coarse final stage
Spray water in areas without structures such as
Matter: A full cone nozzle with a spray surface of 1200 ° is 3 in the plate width direction.
Pieces, arranged at 5m pitch in the longitudinal direction, injection pressure: 3kgf / mm
TwoWith a flow rate of 6 l / min) to the finishing mill group
00mm, 3mm thick strip
The surface quality of the trip was investigated. As a result,
Surface defect rate due to burn-in
And the resulting temperature drop is 5 ° C
Rolling was possible without any reduction in speed.
【００１１】[0011]
【発明の効果】この発明によれば、酸化被膜の生成を促
進するために使用する水の使用量は極めて微量であるか
ら、これによる製造コストの上昇を抑えることができ
る。また、この発明によれば、酸化被膜による荷重軽減
効果によって圧延ロールの焼付きなどが回避され品質の
良好なストリップを安定して製造できる。水の噴射は鋼
材を搬送しながら行うことができるので生産性の低下を
伴うようなこともない。According to the present invention, the amount of water used for accelerating the formation of the oxide film is extremely small, so that an increase in the production cost due to this is suppressed. Further, according to the present invention, seizure of the rolling roll is avoided by the load reducing effect of the oxide film, and a high quality strip can be stably manufactured. Since the water can be injected while the steel material is being conveyed, there is no reduction in productivity.
【図１】この発明を実施するのに用いて好適な設備の構
成を示した図である。FIG. 1 is a diagram showing a configuration of equipment suitable for use in carrying out the present invention.
【図２】この発明を実施するのに用いて好適な設備の他
の例を示した図である。FIG. 2 is a diagram showing another example of equipment suitable for carrying out the present invention.
１ クロップシャー ２ 仕上圧延機群 ３ ミストスプレーヘッダー ４ 粗圧延機 ５ ボックス Ｓ 鋼板 DESCRIPTION OF SYMBOLS 1 Crop shear 2 Finishing rolling mill group 3 Mist spray header 4 Rough rolling mill 5 Box S Steel plate
Claims (1)
て、鋼材表面に霧状の水を噴射してその周りを水蒸気雰
囲気とすることにより酸化被膜の生成を促進することを
特徴とする鋼材の熱間圧延方法。The present invention is characterized in that mist-like water is sprayed onto the surface of a steel material between the regions where the steel material is to be hot-rolled to form a steam atmosphere around the surface, thereby promoting the formation of an oxide film. Hot rolling method for steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34457192A JP2698522B2 (en) | 1992-12-24 | 1992-12-24 | Hot rolling method for steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34457192A JP2698522B2 (en) | 1992-12-24 | 1992-12-24 | Hot rolling method for steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06190403A JPH06190403A (en) | 1994-07-12 |
| JP2698522B2 true JP2698522B2 (en) | 1998-01-19 |
Family
ID=18370305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34457192A Expired - Lifetime JP2698522B2 (en) | 1992-12-24 | 1992-12-24 | Hot rolling method for steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2698522B2 (en) |
-
1992
- 1992-12-24 JP JP34457192A patent/JP2698522B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06190403A (en) | 1994-07-12 |
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